[Android] Add support for a hung renderer dialog

components/infobars/core/infobar_delegate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/infobars/core/infobar_delegate.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "components/infobars/core/infobar.h"
 #include "components/infobars/core/infobar_manager.h"
@@ skipping 40 matching lines @@
       ((nav_entry_id_ != details.entry_id) || details.is_reload);
 }
 
 void InfoBarDelegate::InfoBarDismissed() {
 }
 
 ConfirmInfoBarDelegate* InfoBarDelegate::AsConfirmInfoBarDelegate() {
   return nullptr;
 }
 
+HungRendererInfoBarDelegate* InfoBarDelegate::AsHungRendererInfoBarDelegate() {
+  return nullptr;
+}
+
 InsecureContentInfoBarDelegate*
     InfoBarDelegate::AsInsecureContentInfoBarDelegate() {
   return nullptr;
 }
 
 MediaStreamInfoBarDelegate* InfoBarDelegate::AsMediaStreamInfoBarDelegate() {
   return nullptr;
 }
 
 NativeAppInfoBarDelegate* InfoBarDelegate::AsNativeAppInfoBarDelegate() {
@@ skipping 29 matching lines @@
 
 translate::TranslateInfoBarDelegate*
 InfoBarDelegate::AsTranslateInfoBarDelegate() {
   return nullptr;
 }
 
 InfoBarDelegate::InfoBarDelegate() : nav_entry_id_(0) {
 }
 
 }  // namespace infobars